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wasm_interp: self-review fixes

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Brian Carroll 2022-12-06 08:15:56 +00:00
parent dfbee7b916
commit 2dac57c2bb
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3 changed files with 24 additions and 18 deletions
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10
crates/wasm_interp/src/lib.rs
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@ -57,6 +57,8 @@ impl<'a> ImportDispatcher for DefaultImportDispatcher<'a> {
}
}
/// Errors that can happen while interpreting the program
/// All of these cause a WebAssembly stack trace to be dumped
#[derive(Debug, PartialEq)]
pub(crate) enum Error {
ValueStackType(ValueType, ValueType),
@ -81,12 +83,16 @@ pub(crate) fn pc_to_fn_index(program_counter: usize, module: &WasmModule<'_>) ->
if module.code.function_offsets.is_empty() {
0
} else {
let next_code_section_index = module
// Find the first function that starts *after* the given program counter
let next_internal_fn_index = module
.code
.function_offsets
.iter()
.position(|o| *o as usize > program_counter)
.unwrap_or(module.code.function_offsets.len());
module.import.imports.len() + next_code_section_index - 1
// Go back 1
let internal_fn_index = next_internal_fn_index - 1;
// Adjust for imports, whose indices come before the code section
module.import.imports.len() + internal_fn_index
}
}